Whats the casualty Zone Used For?
After the attacker rolls for hits, the defender chooses casualties and moves them into the casualty zone. Even though they are hit, they still get to fire back (most of the time, there are exceptions). After they fire back, they are removed from the casualty zone.
How many times can u Attack a unit? for ex a sub attacks a brit sub but doesnt kill yet how many times can he do that to him?
The battle lasts until one side or the other is defeated, or the attacker retreats. Subs can also submerge to escape the battle if the other side doesn't have a destroyer. A battle can last for one round of fire (attacker and defender), or for many rounds.
How many men can u Attack and deffend with? if u have more dice laying around is it alright u can used them?
There is no limit to the number of units that can be involved in a battle. Each will fire once per round. Use as many dice as you like, it'll speed things up.
Now if i have a Tank and he gets attack by U.S tank and he wins does my tank keep the damage?
Most units can't be damaged. They are either destroyed or they aren't, and it only takes one hit. Battleships are an exception, taking two hits. If they survive the battle, the hit is repaired immediately.
Also can i Buy more peices for the spring 1942 version or they havent made them yet?
There are no extra pieces available for purchase.